package com.lzq.lottery_system.service.impl;

import com.lzq.lottery_system.common.errorcode.ServiceErrorCodeConstants;
import com.lzq.lottery_system.common.exception.ServiceException;
import com.lzq.lottery_system.common.utils.JacksonUtil;
import com.lzq.lottery_system.common.utils.RedisUtil;
import com.lzq.lottery_system.controller.param.CreateActivityParam;
import com.lzq.lottery_system.controller.param.CreatePrizeByActivityParam;
import com.lzq.lottery_system.controller.param.CreateUserByActivityParam;
import com.lzq.lottery_system.controller.param.PageParam;
import com.lzq.lottery_system.dao.dataobject.ActivityDO;
import com.lzq.lottery_system.dao.dataobject.ActivityPrizeDO;
import com.lzq.lottery_system.dao.dataobject.ActivityUserDO;
import com.lzq.lottery_system.dao.dataobject.PrizeDO;
import com.lzq.lottery_system.dao.mapper.*;
import com.lzq.lottery_system.service.ActivityService;
import com.lzq.lottery_system.service.dto.*;
import com.lzq.lottery_system.service.enums.ActivityPrizeStatusEnum;
import com.lzq.lottery_system.service.enums.ActivityPrizeTiersEnum;
import com.lzq.lottery_system.service.enums.ActivityStatusEnum;
import com.lzq.lottery_system.service.enums.ActivityUserStatusEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

@Service
public class ActivityServiceImpl implements ActivityService {

    private final static Logger logger =  LoggerFactory.getLogger(ActivityServiceImpl.class);

    /**
     * 活动缓存前缀
     */
    private final String ACTIVITY_PREFIX = "ACTIVITY_";
    /**
     * 活动缓存过期时间
     */
    private final Long ACTIVITY_TIMEOUT = 60 * 60 * 24 * 3L;


    @Autowired
    private UserMapper userMapper;
    @Autowired
    private PrizeMapper prizeMapper;
    @Autowired
    private ActivityMapper activityMapper;
    @Autowired
    private ActivityUserMapper activityUserMapper;
    @Autowired
    private ActivityPrizeMapper activityPrizeMapper;
    @Autowired
    private RedisUtil redisUtil;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public CreateActivityDTO createActivity(CreateActivityParam param) {
        //校验活动信息是否正确
        checkActivityInfo(param);

        //保存活动信息
        ActivityDO activityDO = new ActivityDO();
        activityDO.setActivityName(param.getActivityName());
        activityDO.setDescription(param.getDescription());
        activityDO.setStatus(ActivityStatusEnum.RUNNING.name());
        activityMapper.insert(activityDO);

        //保存活动关联的奖品信息
        List<CreatePrizeByActivityParam> prizeParams = param.getActivityPrizeList();
        List<ActivityPrizeDO> activityPrizeDOList = prizeParams.stream()
                .map(prizeParam->{
                    ActivityPrizeDO activityPrizeDo = new ActivityPrizeDO();
                    activityPrizeDo.setActivityId(activityDO.getId());
                    activityPrizeDo.setPrizeId(prizeParam.getPrizeId());
                    activityPrizeDo.setPrizeAmount(prizeParam.getPrizeAmount());
                    activityPrizeDo.setPrizeTiers(prizeParam.getPrizeTiers());
                    activityPrizeDo.setStatus(ActivityPrizeStatusEnum.INIT.name());
                    return activityPrizeDo;
                }).collect(Collectors.toList());
        activityPrizeMapper.batchInsert(activityPrizeDOList);

        //保存活动关联的人员信息
        List<CreateUserByActivityParam> userParams = param.getActivityUserList();
        List<ActivityUserDO> activityUserDOList = userParams.stream()
                .map(userParam->{
                    ActivityUserDO activityUserDo = new ActivityUserDO();
                    activityUserDo.setActivityId(activityDO.getId());
                    activityUserDo.setUserId(userParam.getUserId());
                    activityUserDo.setUserName(userParam.getUserName());
                    activityUserDo.setStatus(ActivityUserStatusEnum.INIT.name());
                    return activityUserDo;
                }).collect(Collectors.toList());
        activityUserMapper.batchInsert(activityUserDOList);

        //整合完整的活动信息,存放redis
        // activityId: ActivityDetailDTO:活动+奖品+人员

        //先获取奖品的基本属性列表
        //获取需要查询的奖品id
        List<Long> prizeIds = param.getActivityPrizeList().stream()
                .map(CreatePrizeByActivityParam::getPrizeId)
                .distinct()
                .collect(Collectors.toList());

        List<PrizeDO> prizeDoList = prizeMapper.batchSelectByIds(prizeIds);

        ActivityDetailDTO activityDetailDTO = convertToActivityDetailDTO(activityDO, activityPrizeDOList,
                prizeDoList, activityUserDOList);
        cacheActivity(activityDetailDTO);

        //构造返回
        CreateActivityDTO createActivityDTO = new CreateActivityDTO();
        createActivityDTO.setActivityId(activityDO.getId());
        return createActivityDTO;
    }

    /**
     *
     * @param param
     * @return
     */
    @Override
    public PageListDTO<ActivityDTO> findActivityList(PageParam param) {
        //获取总量
        int total = activityMapper.count();

        //获取当前页列表
        List<ActivityDO> activityDOList = activityMapper.selectActivityList(param.offset(), param.getPageSize());
        List<ActivityDTO> activityDTOList = activityDOList.stream()
                .map(activityDO -> {
                    ActivityDTO activityDTO = new ActivityDTO();
                    activityDTO.setActivityId(activityDO.getId());
                    activityDTO.setActivityName(activityDO.getActivityName());
                    activityDTO.setDescription(activityDO.getDescription());
                    activityDTO.setStatus(ActivityStatusEnum.forName(activityDO.getStatus()));
                    return activityDTO;
                }).collect(Collectors.toList());
        return new PageListDTO(total, activityDTOList);
    }

    @Override
    public ActivityDetailDTO getActivityDetail(Long activityId) {
        if (null == activityId) {
            logger.warn("查询活动详细信息失败,activityId:{}", activityId);
            return null;
        }
        //查询redis
        ActivityDetailDTO detailDTO = getActivityFromCache(activityId);
        if (null != detailDTO) {
            logger.info("查询活动详细信息成功,detailDTO:{}", JacksonUtil.writeValueAsString(detailDTO));
            return detailDTO;
        }
        //如果redis不存在,查表
        //活动表
        ActivityDO activityDO = activityMapper.selectById(activityId);
        //活动奖品表
        List<ActivityPrizeDO> activityPrizeDOList = activityPrizeMapper.selectByActivityId(activityId);
        //活动人员表
        List<ActivityUserDO> activityUserDOList = activityUserMapper.selectByActivityId(activityId);
        //奖品表: 先获取要查询的奖品id
        List<Long> prizeIds = activityPrizeDOList.stream()
                        .map(ActivityPrizeDO::getPrizeId)
                        .collect(Collectors.toList());
        List<PrizeDO> prizeDOList = prizeMapper.batchSelectByIds(prizeIds);
        //整合活动详细信息,存放redis
        detailDTO = convertToActivityDetailDTO(activityDO, activityPrizeDOList, prizeDOList, activityUserDOList);
        cacheActivity(detailDTO);
        //构造返回
        return detailDTO;
    }

    @Override
    public void cacheActivity(Long activityId) {
        //查询表数据: 活动表, 关联奖品表, 关联人员表, 奖品信息表
        if (null == activityId) {
            logger.warn("要缓存的活动id为空,activityId:{}", activityId);
            throw new ServiceException(ServiceErrorCodeConstants.CACHE_ACTIVITY_ID_IS_EMPTY);
        }
        //活动表
        ActivityDO activityDO = activityMapper.selectById(activityId);
        if (null == activityDO) {
            logger.error("要缓存的活动id有误,activityId:{}", activityId);
            throw new ServiceException(ServiceErrorCodeConstants.CACHE_ACTIVITY_ID_ERROR);
        }
        //活动奖品表
        List<ActivityPrizeDO> activityPrizeDOList = activityPrizeMapper.selectByActivityId(activityId);
        //活动人员表
        List<ActivityUserDO> activityUserDOList = activityUserMapper.selectByActivityId(activityId);
        //奖品表: 先获取要查询的奖品id
        List<Long> prizeIds = activityPrizeDOList.stream()
                .map(ActivityPrizeDO::getPrizeId)
                .collect(Collectors.toList());
        List<PrizeDO> prizeDOList = prizeMapper.batchSelectByIds(prizeIds);
        //整合活动详细信息,存放redis
        cacheActivity(
                convertToActivityDetailDTO(activityDO, activityPrizeDOList,
                        prizeDOList, activityUserDOList)
        );

    }

    /**
     * 缓存完整的活动信息
     *
     * @param detailDTO
     */
    private void cacheActivity(ActivityDetailDTO detailDTO) {
        //key: ACTIVITY_activityId
        //value: ActivityDetailDTO(json)
        if (null == detailDTO || null == detailDTO.getActivityId()) {
            logger.warn("要缓存的活动信息不存在");
            return;
        }

        try {
            redisUtil.set(ACTIVITY_PREFIX+detailDTO.getActivityId(),
                    JacksonUtil.writeValueAsString(detailDTO),
                    ACTIVITY_TIMEOUT);
        } catch (Exception e) {
            logger.error("缓存活动异常, ActivityDetailDTO={}",
                    JacksonUtil.writeValueAsString(detailDTO),
                    e);
        }
    }

    /**
     * 根据活动id从活动中获取详细信息
     *
     * @param activityId
     * @return
     */
    private ActivityDetailDTO getActivityFromCache(Long activityId) {
        if (null == activityId) {
            logger.warn("获取缓存活动数据的activityId为空");
            return null;
        }
        try {
            String str = redisUtil.get(ACTIVITY_PREFIX+activityId);
            if (!StringUtils.hasText(str)) {
                logger.info("获取缓存活动数据为空! key={}", ACTIVITY_PREFIX+activityId);
                return null;
            }
            return JacksonUtil.readValue(str, ActivityDetailDTO.class);
        } catch (Exception e) {
            logger.error("从缓存中获取活动信息异常, key={}", ACTIVITY_PREFIX+activityId, e);
            return null;
        }
    }

    /**
     * 根据基本DO整合完整的活动信息: ActivityDetailDTO
     *
     * @param activityDO
     * @param activityPrizeDOList
     * @param prizeDoList
     * @param activityUserDOList
     * @return
     */
    private ActivityDetailDTO convertToActivityDetailDTO(ActivityDO activityDO,
                                            List<ActivityPrizeDO> activityPrizeDOList,
                                            List<PrizeDO> prizeDoList,
                                            List<ActivityUserDO> activityUserDOList) {
        ActivityDetailDTO activityDetailDTO = new ActivityDetailDTO();
        activityDetailDTO.setActivityId(activityDO.getId());
        activityDetailDTO.setActivityName(activityDO.getActivityName());
        activityDetailDTO.setDescription(activityDO.getDescription());
        activityDetailDTO.setStatus(ActivityStatusEnum.forName(activityDO.getStatus()));

        //activityPrizeDO: {prizeId, prizeAmount, status}
        //prizeDo: {prizeId, name...}
        List<ActivityDetailDTO.PrizeDTO> prizeDTOList = activityPrizeDOList
                .stream()
                .map(activityPrizeDO -> {
                    ActivityDetailDTO.PrizeDTO prizeDTO = new ActivityDetailDTO.PrizeDTO();
                    prizeDTO.setPrizeId(activityPrizeDO.getPrizeId());
                    Optional<PrizeDO> optionalPrizeDO = prizeDoList.stream()
                            .filter(prizeDO -> prizeDO.getId().equals(activityPrizeDO.getPrizeId()))
                            .findFirst();
                    //如果prizeDO为空,不会传入作为参数
                    optionalPrizeDO.ifPresent(prizeDO -> {
                        prizeDTO.setName(prizeDO.getName());
                        prizeDTO.setImageUrl(prizeDO.getImageUrl());
                        prizeDTO.setPrice(prizeDO.getPrice());
                        prizeDTO.setDescription(prizeDO.getDescription());
                    });
                    prizeDTO.setTiers(ActivityPrizeTiersEnum.forName(activityPrizeDO.getPrizeTiers()));
                    prizeDTO.setPrizeAmount(activityPrizeDO.getPrizeAmount());
                    prizeDTO.setStatus(ActivityPrizeStatusEnum.forName(activityPrizeDO.getStatus()));
                    return prizeDTO;
                }).collect(Collectors.toList());

        activityDetailDTO.setPrizeDTOList(prizeDTOList);

        List<ActivityDetailDTO.UserDTO> userDTOList = activityUserDOList.stream()
                        .map(activityUserDO -> {
                            ActivityDetailDTO.UserDTO userDTO = new ActivityDetailDTO.UserDTO();
                            userDTO.setUserId(activityUserDO.getUserId());
                            userDTO.setUserName(activityUserDO.getUserName());
                            userDTO.setStatus(ActivityUserStatusEnum.forName(activityUserDO.getStatus()));
                            return userDTO;
                        }).collect(Collectors.toList());

        activityDetailDTO.setUserDTOList(userDTOList);
        return activityDetailDTO;
    }

    /**
     * 校验活动有效性
     * @param param
     */
    private void checkActivityInfo(CreateActivityParam param) {
        if (null == param) {
            throw new ServiceException(ServiceErrorCodeConstants.CREATE_ACTIVITY_INFO_IS_EMPTY);
        }

        //人员id在人员表中存在
        List<Long> userIds = param.getActivityUserList()
                .stream()
                .map(CreateUserByActivityParam::getUserId)
                .distinct()
                .collect(Collectors.toList());
        List<Long> existUserIds = userMapper.selectExistByIds(userIds);
        if (CollectionUtils.isEmpty(existUserIds)) {
            throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_USER_ERROR);
        }
        userIds.forEach(id ->{
            if (!existUserIds.contains(id)) {
                throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_USER_ERROR);
            }
        });

        //奖品id在奖品表中存在
        List<Long> prizeIds = param.getActivityPrizeList()
                .stream()
                .map(CreatePrizeByActivityParam::getPrizeId)
                .distinct()
                .collect(Collectors.toList());
        List<Long> existPrizeIds = prizeMapper.selectExistByIds(prizeIds);
        if (CollectionUtils.isEmpty(existPrizeIds)) {
            throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_PRIZE_ERROR);
        }
        prizeIds.forEach(id ->{
            if (!existPrizeIds.contains(id)) {
                throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_PRIZE_ERROR);
            }
        });

        //人员数量大于等于奖品数量
        int userAmount = param.getActivityUserList().size();
        long prizeAmount = param.getActivityPrizeList()
                .stream()
                .mapToLong(CreatePrizeByActivityParam::getPrizeAmount)
                .sum();
        if (userAmount < prizeAmount) {
            throw new ServiceException(ServiceErrorCodeConstants.USER_PRIZE_AMOUNT_ERROR);
        }

        //校验活动奖品等级有效性
        param.getActivityPrizeList().forEach(prize->{
            if (null == ActivityPrizeTiersEnum.forName(prize.getPrizeTiers())) {
                throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_PRIZE_TIERS_ERROR);
            }
        });
    }
}
